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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3455d4df6dae34eddd67d72e2e0de57c8fc4454ba925ae43905b323663841eb2' 
  AND token = 'i+u8CIgqxp6CffLQuM5dMFhJBgmih3tSULHNNo90xpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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