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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e971b6a68e0914e7c0958ee6c885687e11a39e2735627b2c3fcb1d15f4868706' 
  AND token = 'j+mb0z4A/zvuPtdXWX9PrIKtfEAu78NBUCLLlvkM8Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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