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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48c4061ba5b6c6de1a1355e725ea20b58b5553495d0f985173e4712686de37b6' 
  AND token = 'EZj4xeMAKLReNqq5tUFsY6zZmJazEq2D1LWbtT1UjG4=' 
  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"
    }
  }
}