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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd7aa47568e1fa98317aecdf37ec379ab2dc96403154d78ac5913d1340fa3114' 
  AND token = 'OpF3i5NiWfBNwzQ740/FKkSd23uaDg3XshEAc1YxvME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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