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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa1a0466fe0f726c26c32e2917d15162155c6bfa05016949139e8a2276b22ac' 
  AND token = 'VA/MbV8rZGoClx5637yQsbKXY0w6RPNJuK4LtTLdHIU=' 
  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"
    }
  }
}