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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '507be430dd11b9634a11a33f25ef0fffe4855e75b1feebcc74adb1c250c0f1be' 
  AND token = 'EQ/s5MBq4Z1S8YxU4OmbFoQar6S2k8xN/yya4GPJ6hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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