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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82b680f883de3ae709ac7b15af4d7d4d9f88d0a1d1f4a62ece300e88228105a' 
  AND token = 'o9wgqDIp2kAT3g1fMFHt1PnejUfvh0S3weosaat0N+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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