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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc8b3564a1ae32c139ae593557740ec3b365795d4f97b58bb199d193cb5d437' 
  AND token = 'CJ1IccLTMPMN7WTdX5zJ8ospyrY/TGg1zZ/xEq1ULzo=' 
  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"
    }
  }
}