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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6818f589c8e036ca3119e2c503bafafb36a8f9d232a0274035afcad2bcf3cdd' 
  AND token = 'r0L0o3GV/gwF8czZrolhgT4+NLcOhsSTI4ET7Mf/P/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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