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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c550de762a4d7c97d2d5abebf310998c0520b2a7500bf3a1b9155b3f0d910b' 
  AND token = 'ksHMzXVat4cxlqH9dJq0t6EOjKqi98DF/Q/BEmP/HaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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