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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c820baf7a68d9b627eec6170f0273357d31d55f3ab72197213b11d536053a14f' 
  AND token = 'NcghSfv58Q+lW+CwRgS1Ci5Nq6mRRpEsbI2s47iHtNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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