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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd6eddd21d941bff0ba9fa1debcb5700e16604493724f28f7cf2990d18c4402' 
  AND token = 'rRQZ9R+K3FOyqYrJS8u9BSoz7bYz4kxJ1R+di/dmmms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}