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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47af0b0813a9b4637f233ef4889f2e2c1043347550a2f6b166653c634e5e49f1' 
  AND token = 'FscnDZ0iAyZf7z/D6aDlawdSx4GxAZJvUUrWtb1olxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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