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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e7f48e0723fc14e7f655702dd0eacc2e547ba4815fac08c25e42cedd703ec5' 
  AND token = 'kTvrYIbNQ52XDcnFnh5eZY9cDKEEnfn1FyEjSsXoc7w=' 
  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"
    }
  }
}