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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b87ca226e70d4c329a4bfe6e3d6f1b98302a208db6de4d36647a40462d5506' 
  AND token = 'dGKRBIsFoP0k6FRNRz+vf454Wu6dnYVnXT6Obsep5QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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