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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e707c6a06682af5bf16d291f59bc8d7b890ef1e9891b5779a7a2e9b5906d70' 
  AND token = '+YVzHq2C9XbCRQZZkVCHyb8J537S3sJQmMoKccYYAms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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