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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c93456dcc8b69d9469a89d43b59fe893eda9b94048e48b04fb294967bb0a3a3' 
  AND token = 'tgHwatOx8Z9MO1zFIU81Vabo4s00CW/d4X4wY47yMTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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