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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7db4dea295926f7b719080b54be44d11d92dd765a9e8d69638246bc3abd503f' 
  AND token = 'YSuVRrPoGW3pEbEH8Ar+j46wB3Cqa8XsKpcDA6oENRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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