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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e10e8b08741614752e2ce0cb2fe198fc68c19ea8f918d971d75309bee8e2077' 
  AND token = 'j8A6O+w51QAJDMzwDz8A+i/PViJQuluc8q97PvwtBZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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