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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78a37a3c302b05ed54c7ff0b3296d354bf902b541b090b3e513039e870c6fd62' 
  AND token = 'taaZs0oaXS6gsp85p2O0iPQ+fcLTvogJiPEXl/RA3V0=' 
  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"
    }
  }
}