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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48006c554cf259ac227dd655ccabe27209f34c548946587645ee521fc136153b' 
  AND token = 'j2CPTzQ7HX/cT9NlvWzQ20qfIUdKyRWzkiMXFC3DcZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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