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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed92800bf18ee30ffa2d882ae15d4b1ec11810c7f2797c0264bdb084cf4c827f' 
  AND token = 'zhTny1pDUJwPT0+qJiGnqKaFxeFodAwV/W/znvt1/JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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