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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316b4d49c18bd64f2d61f80e5ef4a603a89985ee3e38062e7ae2a665ab7dc882' 
  AND token = 'X+I8KLKzwe4owh5zQH1eq50QeZW8Nj82/5Q+VrcJcmY=' 
  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"
    }
  }
}