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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c4cd732c89a8cf1641c0e5d2298ee35dd937583215f7b6b2c8e23461a11b2a' 
  AND token = 'vegsPRWGAHOw3+kVbe7CMlxCCsbeRm0kDUV8fsZ2U1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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