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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b869b2e9517ba86f27dea294cfed2243bfe3be480161f064eea30117f956837e' 
  AND token = '9Y+9FNGkCYB6Rmd3enpxU7CO4ZA82H+7jtLg/5xo/+E=' 
  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"
    }
  }
}