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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e36d8d4580a45639788a238a116c55117dd742da9afa889559de213b1e6cbd0d' 
  AND token = 'Z7Zg38mMudLN+N4GwefvufbxBt+1nh6DR0H6WFBlvNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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