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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e86476502ed7d38b0ea53d90cd2ac33629698f4c1d76120b32db0eb25985f00f' 
  AND token = 'OpJlansm1SmUJOf9SuzE27zDp1WWClivW9kjHJhDcTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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