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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ef09968b35899426edc2695b0794a9f0171f2a3d232899ad1f81f5d3c454cf2' 
  AND token = 'GiuymXok9BanS2Eq+b4cf+v5qDKaKCS3z+x4LouqTVw=' 
  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"
    }
  }
}