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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2285181672646373c5b8041dd903ddb3b7f174eba706e827c4f77ed68e093dae' 
  AND token = 'x6MyJrTwAethbJzm16mlxfZOfCNod4V5q5bLRYZL+0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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