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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a35853fc7d89477f86090a71fde2932248b60800884a3799d197f675291729f' 
  AND token = 'x8bBIkp2NwOhPff7GlVZzcvnbIEn4S84brmbBVnc8BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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