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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a281b70606b20d5b13b24e15ec02cbc33c0670a3f16c86a19f8a4d40725bcad8' 
  AND token = 'oo37pVexpoDzvu0jvo+dygaoR6KY53W/y1z25jq6Mno=' 
  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"
    }
  }
}