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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5db69bd85b0319508bb7c5274e61b9d97a0fb60b52cafaa6ebc1be68028532f' 
  AND token = 'EMktfovPYWNvw3c7R+KLCYX9b2vEn1e1RbXesXMfa2Y=' 
  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"
    }
  }
}