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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf418fe57b7b388d8f2070a3da222c6172c607bf4eeca9986231168c342317d' 
  AND token = 'A6UBGtdPtjuWWNt+d92NBJB3//kGDpCK9uDyNUTB+UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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