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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd796d8333e50eaefcff8f71bbe27b7a0c96bc37961b62f6242605bd085e12987' 
  AND token = 'gB6xp/JphOZ3BgLrf1cCeJLRD7VeHxoI4+PtvaeeLoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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