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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6167c1d6dc3da12c3bf32f1eb902fb680fa9920a46a9ec355dc72f0b13c4a6' 
  AND token = 'fjpRdyEygv8ufV3y0eSjzQMi/jU0y2GhhX/WjbSJJww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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