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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbda7d018cf94769d546f90baa88b6d6f5fde32aed8f9d967a8aa9433f3541f0' 
  AND token = '8CKke4evSckIdIjxX5ftsYPlgJ3WRSKiVOanuJpbxtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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