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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4854771f8063e46606167644d41d87a0fcca8ce0f207f1d03d5e595d9d14a9' 
  AND token = '2wY7RDFBh6mK5dY96DgcNgbFV69sDRxvY6KfCfsRGsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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