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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0f9ef2dea719064290bd2d60ff42b3862dcd532bfd8dc358da59c1745b2ebb' 
  AND token = 'LN74q1LAn0TOmWoYgl2d5RIqPIh9pFpi20pb8v+lRO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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