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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef5b997f1a831616b378f3f01388f5fd8549bf6e4e6d4858ef83e17e34892c2' 
  AND token = '42rMRRukkQnDDSDz3YQyA2SmH7lDY6cN7IT1VYt0A98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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