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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb45cd7e38071bc4ce8b99a526189266f75bd8c38c8e21af1753c107b10750a' 
  AND token = 'klAgDFDrFvnY2SU43b0wsD5MUtzZ4PYH0mIVRjb5dyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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