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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd9065835823ddc0360b63f61f7db4841942f6bb61001d12024d3d20ad5919d3' 
  AND token = '6wa9LIb6zXL4kMITvBhUdu+RmBRixGTD5YYpQ1claSA=' 
  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"
    }
  }
}