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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f34ce219b4f96daa7fa74e3a5a46dc104488cc152c4c3b2c23328b0e1c8241' 
  AND token = 'w7xl+0oEdp9+LLr2yo2c0pjq+JDe5DXniMG7d2hTlAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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