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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f65fc2a26496a67de016e556db1a49c47f5f23a8a2f5ecc7eb63a4a3fed7ed29' 
  AND token = '/E48F2Rm839CcgO+Jg/mYXVFXvfCFFiJnw7/g/3wrI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00149

JSON explain

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