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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026f0e26a9d0e7067a4104148e5a949a1c0f2ad4a4ef95cf22ec9cd69556354c' 
  AND token = 'lQzu9SWa7lUJluNIxiDQyiGT2C636Y6UkI+95/2uKlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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