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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0366670a0e3fda083887ccca759e7b44a9a6d6827e055a721102b3866fe26e8c' 
  AND token = 'E1yQLIFyrg2tlJfLDPEI9lM37baT1sJh3j3Ip0V0emk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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