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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad785c331f3042a38ca3451624910c138111402edbf1a8c557c092433d2ffb7' 
  AND token = '7Xm5fjamHWlHm39cX9H/mU5W3egzuzEJrBn7nVP5JIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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