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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd215a9f21a138acea6ee801676dc70d3fd719e0507fa12213b87cd522a3cb9f6' 
  AND token = '9O9mnduKR/bZuoLwaMy9Frfgck4a9G/wXPETRM0KCGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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