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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb91b57d8f42bb80567ace75c086bbb473f5ea8d08e84cf1748b8dca046c909' 
  AND token = 's/IIliLf0eH+orsWU2JgUu/Ht+bcVMjCCvSHOMCh54Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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