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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '580cec8caff8bda3f8a4852ff3c3e4bf662b4d970007f6c8d45475a6bcfce70a' 
  AND token = 'HT7+Me/Fgu0+PdilibQRtEXJPyN91TAQQ9xKH3s726g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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