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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a7a1513590175662c4260cc62c79c98e2bd1f6bb240874858f7d357f8aec9a' 
  AND token = 'BRbrhSBdJSU3SvZ186LEmtc0j6TJx03CY6Lwu5DjMNo=' 
  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"
    }
  }
}