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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4207ef3ad72b5f8050a74b27f25aaf9b2a679f266dfa401d21a19eefed438e' 
  AND token = 'uvHmAlRskJOmVHV+e+MacgI1xtd7tpTpvqnyd8goRuY=' 
  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"
    }
  }
}