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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a86d95bb9340454a238062b24787deff376db48875c226d2c889f52cad98ad8' 
  AND token = 'eDzgA2QEUogBoxj5Oq+Ptvd9fnXb44hNLsyGv4YMvoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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