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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45a3920c33e7dae4ad6ef56201f50225763bc49ad83086833c75b2b43944cca5' 
  AND token = 'EwT2rdILB66VbbqYohwrQa9JdD+zJR2OHmOjWHfJsMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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