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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae3d028dc9c320b5b70d0903629e02aeb6ef155eb636c669f8c1f723cd20210' 
  AND token = 'vPoEW8ve/rCt7uC5TJRVJJuVQICPAs1tur1vy2kTA+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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