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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78bae566936255ffefd24a47f22382e8f5b61a00d2c59890f95ab74ee7ed9d10' 
  AND token = 'Q9vMp1HAewgoMR+xb/1BztTA/vGxN764+M/Y/Uk15mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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